Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole. 
Although the acreage involved in a national boundary dispute may seem insignificant, even the slightest ------- in a country’s alleged border appears ------- to that nation, a threat to its security.
Answer Choices  (A) inconsistency . . felicitous  (B) variation . . trivial  (C) rigidity . . traumatic  (D) change . . favorable  (E) breach . . ominous